I bought the book on 30/4/2008. After I found out that I already had . Due to next day is 1/5/2008 Labour day, so I try to return on 2/5/2008. The head of the book store not allow me to refund or exchange. According to him, this is the rule was fixed by agent. But i call up distributer, they said no such thing. Do you think this is the right way?